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. 2009 Apr 30;37(12):3990–3995. doi: 10.1093/nar/gkp277

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© 2009 The Author(s)

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — (A) EPR spectra of the spin-labeled aptamers 1 (blue), 2 (green) and 3 (red) at various concentrations of cocaine in an aqueous solution at 20°C. The slow-motion component of the EPR spectra is indicated by an arrow. (B) A plot of the h_a/h_b ratio of the aptamer EPR spectra (see insert) vs. concentration of cocaine. h_a is the height of the low-field peak and h_b is the height of the centre peak of the EPR spectrum. (C) Relative fluorescence of reduced aptamers 1–3, plotted as a function of cocaine concentration in an aqueous solution at 20°C.